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> Glimpse of Things to Come?
Brando
post Dec 10 2006, 01:12 PM
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^^^ Looks like the area being reinforced in Eric's photos didn't really need it...

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JPB
post Dec 10 2006, 01:51 PM
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Did ya do a torsion test on this gusset setup?
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Eric_Shea
post Dec 10 2006, 02:42 PM
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QUOTE
Looks like the area being reinforced in Eric's photos didn't really need it...


Well, even a guy like you can see what the gussets did for that arm (IMG:style_emoticons/default/biggrin.gif)

Seriously, the gussets aren't to prevent mass failure as in John Rogers case or the arm that Brett is showing. They are there to prevent flex while driving the car. This was part of the conversation I had with Erik Madsen, that area does flex. I felt that even the simple gusset arrangement I've added will help reduce that flex tremendously... that's what gussets are for.

I think I've accomplished my goal. A control arm that is 40-50% more ridgid than stock without the weight penalty.

QUOTE
Note to self, don't trust Eric's scale


Note to Steve... don't you have a running car to purchase to take to an event, tear apart so you can't make the event, rebuild then sell??? (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/tongue.gif)

Jim (Stratplayer) was just here and witnessed the scale first hand... so THERE! (IMG:style_emoticons/default/bootyshake.gif)
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Eric_Shea
post Dec 10 2006, 03:05 PM
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QUOTE
Here is a good example, albeit extreme, of what happens to an swing arm when radically loaded through the tire contact patch


Brett, just the tire contact patch caused that control arm to bend down at a 45 deg angle? Or, was it the wheel coming in contact with a curb. That would be some serious grippage... (IMG:style_emoticons/default/ohmy.gif)
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LvSteveH
post Dec 10 2006, 10:02 PM
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QUOTE(Eric_Shea @ Dec 10 2006, 12:42 PM) *

Note to Steve... don't you have a running car to purchase to take to an event, tear apart so you can't make the event, rebuild then sell??? (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/tongue.gif)

Jim (Stratplayer) was just here and witnessed the scale first hand... so THERE! (IMG:style_emoticons/default/bootyshake.gif)


Actually, the car's back running again, although still on jackstands, and I'll never be able to sell it, I'm in too deep. Should be pretty neat when it's finished though. I'd like to have it going for spring.
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Brett W
post Dec 10 2006, 10:06 PM
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Since my big wing on the back generates 10K lbs of, Of course it was through the tire contact patch. You ought to see how powerful my car is.

Actually that was a curb applied through the lower sidewall, upon impact. Yes it was pretty radical example but the arm didn't really bend in laterally, it actually twist.
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Eric_Shea
post Jan 27 2007, 02:18 PM
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Stratplayer was gracious enough to apply the powdercoating. (IMG:style_emoticons/default/smilie_pokal.gif)

I'm happy. Here's my line of thought.

1. From measurements I've seen these should be 50% stiffer than stock.
2. There is literally no measurable weight penalty.
3. Could they be stiffer? Yes.
4. Should they be stiffer? There's a lot of arguments against that.

This and a decent set of bushings will net a rear control arm assembly that is better than 90% of the 914's that are currently out there.

Here's a few pics. I've yet to press out the old bearings (I left them in to powdercoat them).


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Aaron Cox
post Jan 27 2007, 03:26 PM
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sweet!

what if you ran one at a 45 degree angle.. inner right bottom to upper left top etc?

oh wait... too much geometry LOL


looks good dude
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So.Cal.914
post Jan 27 2007, 03:58 PM
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Cool, idea stolen for mine.
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sean_v8_914
post Jan 28 2007, 11:48 AM
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96.75% of all statistics are made up on teh spot

what measurement was made to determine percent of improvement?

what club member did the rear arm flex measurement fixture? I remember a thread about this
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Twystd1
post Jan 28 2007, 04:15 PM
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Chris Foley was in that other thread.

He apparently has figured out how to strengthen the arm with very little weight.

Now where the hell is that thread...???

I Think he opened the arm up and boxed it internally. Then welded a patch over it.

Thats my memory of that thread. Could be wrong.

I can't find it.

C
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jd74914
post Jan 28 2007, 04:57 PM
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Its only on the 914club now :shrug:

Since Brad has no pictures up they are gone though.

http://www.914club.com/bbs2/index.php?show...873&hl=weak
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JPB
post Jan 28 2007, 06:34 PM
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Any extra stiffyness is good stiffyness. Thanks for sharing and will probably hole saw a couple of tubes in on mine some time as well as the goossetes. (IMG:style_emoticons/default/beer.gif)
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roadster fan
post Jan 28 2007, 09:50 PM
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IIRC, Chris Foley cut the arm in half perpendicularly. He then welded a piece of 1/8" plate between the two. I think he said the kerf on the cut was about 1/16" so he only made the arm 1/16" longer by adding the plate. I thought I had the pics but couldn't locate them....sorry (IMG:style_emoticons/default/dry.gif)

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roadster fan
post Jan 28 2007, 09:56 PM
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I think this is how he did it....

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Rusty
post Jan 29 2007, 10:10 AM
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QUOTE(jd74914 @ Jan 28 2007, 04:57 PM) *

Its only on the 914club now :shrug:

Since Brad has no pictures up they are gone though.

http://www.914club.com/bbs2/index.php?show...873&hl=weak


Older threads are in the same place... updated domain name.

http://www.914world.com/bbs2/index.php?showtopic=42873

Hope this helps,
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TravisNeff
post Jan 29 2007, 10:26 AM
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All the pictures had been removed from that thread by the poster.
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Spoke
post Apr 29 2007, 10:29 AM
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I used Aaron's idea of supports on 45 degree angles. Used two 3/8 inch rods crossed in 2 places.

Any ideas if this will help the flex?

Spoke


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JPB
post Apr 29 2007, 10:58 AM
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For that to work really good, one would have to weld the two rods together where they cross in the center.

If we cut the box lengthways through the center and added a 1/8th plate that goes from one side to the other in the same plane as the bolt welded solid on all the way around, it would make a huge increase in stiffness. If the bolted end had a flare like a single gusset similar as above but just down the center and welded solid, it would be amazing.
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SirAndy
post Apr 29 2007, 05:15 PM
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QUOTE(jd74914 @ Jan 28 2007, 02:57 PM) *

Its only on the 914club now :shrug:


chris foley deleted all his posts here after the split ...
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